Bare carts are fine, so long as they're legit. I have Metal Slug 4, Metal Slug 5 and Neo Turf Masters MVS kits to offer in trade. I'm looking for KOF 2003 first and formost.
I also have games for Genesis, Sega CD, 32X, Saturn, Dreamcast, N64, PS1. PS2 and Xbox to offer up for trade as well...